ABOUT ONE FEATURE OF TWO SIMMETRICALLY CONVERGING PLANE WAVES OF FUSION BURN

K. V. Khishchenko, A. A. Charakhchian
VANT. Ser.: Mat. Mod. Fiz. Proc 2013. Вып.3. С. 30-40.

The paper considers a 1D problem of two equal laser pulses simultaneously and symmetrically impacting a plane solid DT-fuel layer. There have been studied two options with different initial densities of mixture: normal density at atmospheric pressure and density . The problem is set up for equations of single-speed two-temperature hydrodynamics with regard to electron and ion heat conduction, intrinsic plasma emission, and fuel heating by -particles from the primary DT-reaction and laser radiation, which is absorbed completely in the vicinity of point with critical density. The study is focused on fusion burn waves converging to the plane of symmetry and emerging at some choice of the layer thickness and laser radiation parameters.

It is shown that such waves have an interesting feature: a flow with compression velocity profile , where tangent of slope angle increases with time t with respect to space coordinate x, occurs in front of the combustion wave. As a result, quick compression (relative to a cold fuel) takes place in front of the wave. With the initial density of fuel , the density of fuel in front of the wave becomes 100 times (and even more) higher and comparable with the density expected from the use of the first driver according to the concept of quick ignition. The neutron energy gain of DT-reaction is ~ 45 for initial density and ~ 500 for initial density .

Keywords: inertial confinement fusion, slow combustion wave, fusion burn wave, flows with linear velocity profile.

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